C# 当表单字段留空时,MVC2中出现NerdDinner表单验证DataAnnotations错误
平台:Windows7UltimateC# 当表单字段留空时,MVC2中出现NerdDinner表单验证DataAnnotations错误,c#,asp.net-mvc-2,null,data-annotations,nerddinner,C#,Asp.net Mvc 2,Null,Data Annotations,Nerddinner,平台:Windows7Ultimate IDE:VisualStudio2010终极版 Web环境:ASP.NET MVC 2 数据库:SQL Server 2008 R2 Express 数据访问:实体框架4 表单验证:数据注释 示例应用程序:来自Wrox Pro ASP.NET MVC 2的NerdDinner 书籍:Wrox Professional MVC 2 第1章的问题-章节:“将验证和业务规则逻辑与模型类集成”(第33至35页) 错误简介:NerdDinner表单验证错误,带有Da
IDE:VisualStudio2010终极版
Web环境:ASP.NET MVC 2
数据库:SQL Server 2008 R2 Express
数据访问:实体框架4
表单验证:数据注释
示例应用程序:来自Wrox Pro ASP.NET MVC 2的NerdDinner
书籍:Wrox Professional MVC 2
第1章的问题-章节:“将验证和业务规则逻辑与模型类集成”(第33至35页) 错误简介:NerdDinner表单验证错误,带有DataAnnotation和db null 当数据库字段设置为不允许空值时,示例代码中的DataAnnotation不起作用 书中的代码和从codeplex下载的示例代码出错 救命!我真的为此感到沮丧!!我真不敢相信这么简单的事情竟然不起作用??? 重现错误的步骤:
我已经向Wrox和其中一位作者发出了帮助请求,但没有收到任何人的回复。由于这些错误,本书的读者甚至无法继续完成第1章的其余部分。即使我从Codeplex下载了最新版本,它仍然有相同的错误。有人能帮我,告诉我需要修复什么吗?谢谢-Ed.终于找到了这本书的Wrox论坛,找到了答案。答案确实令人惊讶。它与Visual Studio 2010中的调试器有关 基本上只要按F5继续,一切正常 这里是论坛帖子的链接,有更多答案:
工具->选项->(展开)调试->(常规)启用异常助手 这只是Visual Studio试图提供帮助!:)一开始也吓了我一跳……我还以为代码中出现了一些错误。是的,只要继续执行,一切都会好起来。验证内部将捕获异常(此异常以及其他异常,如转换、范围等)并将其记录在ModelState.Errors集合中
[MetadataType(typeof(Dinner_Validation))]
public partial class Dinner { }
[Bind(Include = "Title, EventDate, Description, Address, Country, ContactPhone, Latitude, Longitude")]
public class Dinner_Validation
{
[Required(ErrorMessage = "Title is required")]
[StringLength(50, ErrorMessage = "Title may not be longer than 50 characters")]
public string Title { get; set; }
[Required(ErrorMessage = "Description is required")]
[StringLength(265, ErrorMessage = "Description must be 256 characters or less")]
public string Description { get; set; }
[Required(ErrorMessage="Event date is required")]
public DateTime EventDate { get; set; }
[Required(ErrorMessage = "Address is required")]
public string Address { get; set; }
[Required(ErrorMessage = "Country is required")]
public string Country { get; set; }
[Required(ErrorMessage = "Contact phone is required")]
public string ContactPhone { get; set; }
[Required(ErrorMessage = "Latitude is required")]
public double Latitude { get; set; }
[Required(ErrorMessage = "Longitude is required")]
public double Longitude { get; set; }
}
public class DinnerRepository
{
private NerdDinnerEntities _NerdDinnerEntity = new NerdDinnerEntities();
// Query Method
public IQueryable<Dinner> FindAllDinners()
{
return _NerdDinnerEntity.Dinners;
}
// Query Method
public IQueryable<Dinner> FindUpcomingDinners()
{
return from dinner in _NerdDinnerEntity.Dinners
where dinner.EventDate > DateTime.Now
orderby dinner.EventDate
select dinner;
}
// Query Method
public Dinner GetDinner(int id)
{
return _NerdDinnerEntity.Dinners.FirstOrDefault(d => d.DinnerID == id);
}
// Insert Method
public void Add(Dinner dinner)
{
_NerdDinnerEntity.Dinners.AddObject(dinner);
}
// Delete Method
public void Delete(Dinner dinner)
{
foreach (var rsvp in dinner.RSVPs)
{
_NerdDinnerEntity.RSVPs.DeleteObject(rsvp);
}
_NerdDinnerEntity.Dinners.DeleteObject(dinner);
}
// Persistence Method
public void Save()
{
_NerdDinnerEntity.SaveChanges();
}
}
// **************************************
// GET: /Dinners/Create/
// **************************************
public ActionResult Create()
{
Dinner dinner = new Dinner() { EventDate = DateTime.Now.AddDays(7) };
return View(dinner);
}
// **************************************
// POST: /Dinners/Create/
// **************************************
[HttpPost]
public ActionResult Create(Dinner dinner) {
if (ModelState.IsValid)
{
dinner.HostedBy = "The Code Dude";
_dinnerRepository.Add(dinner);
_dinnerRepository.Save();
return RedirectToAction("Details", new { id = dinner.DinnerID });
}
else
{
return View(dinner);
}
}
// **************************************
// GET: /Dinners/Edit/{id}
// **************************************
public ActionResult Edit(int id)
{
Dinner dinner = _dinnerRepository.GetDinner(id);
return View(dinner);
}
// **************************************
// POST: /Dinners/Edit/{id}
// **************************************
[HttpPost]
public ActionResult Edit(int id, FormCollection formValues)
{
Dinner dinner = _dinnerRepository.GetDinner(id);
if (TryUpdateModel(dinner)){
_dinnerRepository.Save();
return RedirectToAction("Details", new { id=dinner.DinnerID });
}
return View(dinner);
}